I have installed 1.5.12 and though it looks good, it needs to be improved for google image seo: You need to have an alt tag for the main image.
I don't care about alt tags in all other images eg the filmstrip.
See the criteria for an optimised image here ww.toprankblog.com/2010/06/6-tips-image-seo/
Any help much appreciated!
Copy function theme_html_picture from themes/sample/theme.php to your theme's theme.php file, if it doesn't exist.
Then, find
alt=\"\"
and replace with
alt=\"{$CURRENT_PIC_DATA['filename']}\"
(twice).